Subject: RE: [stella] Math riddle : Loading TIM64T with 43 burns only 36 scanlines (not 37) From: "Dennis Debro" <ddebro@xxxxxxxxxxxxx> Date: Mon, 10 May 2004 22:12:59 -0400 |
Hi there, > Of course in the 2600, there are no interrupts. So you have to check when > the count is 255. You can use the interrupt to determine when the timer is done. It's done in some games. One in particular is Moonsweeper (since I'm transcribing it now). IIRC Bob also does this in Dragonfire. Bob sets the timer and then does... VBOUT BIT TIMOUT ; WAIT FOR VB OVER BPL VBOUT to determine when the timer is done. TIMOUT is register $285. Take care, Dennis ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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